The 1999 Mazda B2600 range of configurations is currently priced from $2,200.
The 1999 Mazda B2600 carries a braked towing capacity of up to 1500 Kg, but check to ensure this applies to the configuration you're considering.
From what you have told us it would seem that it’s not the engine itself, the top-end has been rebuilt without solving the problem, and rebuilding the bottom-end is unlikely to fix it either. I would be looking at the places where oil and coolant could interchange, such as the intercooler, turbo etc.
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The Mazda B2600 1999 prices range from $2,200 for the basic trim level Extra Cab Bravo to $6,380 for the top of the range Single Cab Bravo.